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Topic: Latent heat

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	Heat - Wikipedia, the free encyclopedia
		Heat flows between regions that are not in thermal equilibrium; in particular, it flows from areas of high temperature to areas of low temperature.
		Latent heat is heat per unit mass necessary to change the state of a given substance.
		Heat pipe: Using latent heat and capilliary action to move heat, it can carry many times as much heat as a similar sized copper rod and is starting to have applications in laptop personal computers.
	en.wikipedia.org /wiki/Heat (1619 words)

	Latent Heat Explained (Site not responding. Last check: 2007-11-06)
		Latent heat is not lost, but reappears whenever water, ice, or steam pass through a reverse cycle, or phase transition, from a gaseous to a liquid, or from a liquid to a solid state.
		Latent heat is expended in overcoming the molecular cohesion of the particles that constitute the substance, and in overcoming the the resistance of external pressure (boiler pressure) to a change of volume of the heated substance.
		The latent heat of vaporization, therefore, may be said to consist of "internal" and "external" heat, the former being utilized in overcoming the molecular resistance of the water in changing to steam, while the latter is expended in overcoming any resistance to the increase of its volume during formation.
	energyconcepts.tripod.com /energyconcepts/boilersteam.htm (1320 words)

	latent heat
		Latent heat is the heat energy involved in the phase change of water.
		The heat added during evaporation is used to break hydrogen bonds between water molecules and does not raise the temperature of the water body.
		Latent heat released during condensation is an important source of energy to drive atmospheric systems like hurricanes and cumulus clouds.
	www.uwsp.edu /geo/faculty/ritter/glossary/l_n/latent_heat.html (105 words)

	Physical State/Latent Heat
		Latent means hidden, so latent heat is "hidden" in the water molecule--we can't feel it, but it is there.
		Latent heat is the energy absorbed or released when a substance changes its physical state.
		Latent heat is absorbed upon evaporation, and released upon condensation to liquid (as in clouds).
	daphne.palomar.edu /jthorngren/latent.htm (951 words)

	Heat - Latent Heat (Site not responding. Last check: 2007-11-06)
		Latent heats of fusion vary widely, and values should always be accompanied by the temperatures at which they were measured (these are not necessarily the normal melting points).
		The latent heat of evaporation is the energy required to overcome the molecular forces of attraction between the particles of a liquid, and bring them to the vapour state, where such attractions are minimal.
		Latent heats of vaporization vary widely, and values should always be accompanied by the temperatures at which they were measured (these are not necessarily the normal boiling points).
	www.physchem.co.za /Heat/Latent.htm (794 words)

	6(c). Energy, Temperature, and Heat
		Heat is often defined as energy in the process of being transferred from one object to another because of the temperature difference between them.
		Heat Capacity - of a substance is the ratio of the amount of heat energy absorbed by that substance to its corresponding temperature rise.
		Specific Heat - is the heat capacity of a unit mass of a substance or heat needed to raise the temperature of 1 gram (g) of a substance 1 degree Celsius.
	www.physicalgeography.net /fundamentals/6c.html (506 words)

	AllRefer.com - latent heat (Physics) - Encyclopedia
		Latent heat, also called heat of transformation, is the heat given up or absorbed by a unit mass of a substance as it changes from a solid to a liquid, from a liquid to a gas, or the reverse of either of these changes.
		The latent heat of vaporization of steam is 540 calories per gram, absorbed during vaporization or given up during condensation.
		For a substance going directly from the solid to the gas state, or the reverse, the heat absorbed or given up is known as the latent heat of sublimation.
	reference.allrefer.com /encyclopedia/L/latenthe.html (286 words)

	Heat Transfer
		Latent heat is the heat energy required to change a substance from one state to another.
		Latent heat of evaporation is the energy used to change liquid to vapor.
		Latent heat of condensation is energy released when water vapor condenses to form liquid droplets.
	okfirst.ocs.ou.edu /train/meteorology/HeatTransfer.html (903 words)

	What is meant by latent heat (Site not responding. Last check: 2007-11-06)
		Heat is absorbed in the liquefaction of ice, and in the vaporization of water, yet the temperature does not rise during either process, and the heat absorbed is therefore said to become latent.
		The latent heat, in point of fact, is not uniform at all temperatures, neither is the total amount of heat the same at all temperatures.
		The absolute quantity of heat in any body is not known; but the relative heat of bodies at the same temperature, or in other words their specific heats, have been ascertained and arranged in tables,-- the specific heat of water being taken as unity.
	www.harvestfields.netfirms.com /ebook/01/010/04.htm (4118 words)

	Latent Heat
		LATENT HEAT, or hidden heat, is the term used for the heat absorbed or given off by a substance while it is changing its physical state.
		In other words, sensible heat is the term for heat that affects the temperature of things; latent heat is the term for heat that affects the physical state of things.
		The heat that must be removed from a substance to change it from a liquid to a solid (or, the heat which must be added to a solid to change it to a liquid) without change in temperature is called the LATENT HEAT OF FUSION.
	www.free-ed.net /sweethaven/MechTech/Refrigeration/coursemain.asp?lesNum=2&modNum=7 (567 words)

	Latent heat - Wikipedia, the free encyclopedia
		Latent heat describes the amount of energy in the form of heat that is required for a material to undergo a change of phase.
		One is the latent heat of fusion (melting), and the other is the latent heat of vaporization (evaporation).
		If the water vapor is returned to a liquid or solid phase (by condensation or sublimation), the stored energy is released as sensible heat onto the surface where condensation (or sublimation) has occurred.
	en.wikipedia.org /wiki/Latent_heat (221 words)

	Physics 20: Specific Heat Capacity and Latent Heat (Site not responding. Last check: 2007-11-06)
		Specific heat capacity is the quantity of heat required to raise the temperature of a unit of mass of a substance by a unit change in temperature.
		The specific latent heat of a substance is the quantity of heat energy required to change the state of a unit mass of a substance.
		is the heat transferred, in joules, m is the mass, in kilograms, and l is the latent heat in joules per kilogram.
	www.sasked.gov.sk.ca /docs/physics/u4b2phy.html (872 words)

	Heat Fluxes & the Energy Balance (Site not responding. Last check: 2007-11-06)
		Thus, a positive sensible heat flux indicates the dominant flow of energy between the air and the surface is away from the surface and towards the air.
		If sensible heat flux is negative, the dominant direction of energy flow is from the air to the surface; this means that the air is loosing energy and the surface of the earth is gaining energy.
		Latent heat flux is also negative, which also means energy is transferred from the air to the surface.
	www.uwsp.edu /geo/faculty/lemke/geog101/miscellaneous/heat_fluxes.html (1732 words)

	Essays Page (Site not responding. Last check: 2007-11-06)
		The absorption and release of latent heat do not alter the temperature of the substance itself, but they do alter the temperature of the surrounding medium, because it is from that medium that absorbed latent heat is obtained and into the medium that released latent heat is introduced.
		The latent heat that is released when a liquid solidifies is exactly equal to the amount absorbed when the solid phase of the same substance melts.
		The Hadley cells are driven partly by the absorption and release of latent heat of vaporization.
	www.fofweb.com /Subscription/Science/Helicon.asp?SID=2&iPin=enweath1932 (800 words)

	Heat
		Heat is a way of transferring energy between a system and its surroundings that often, but not always, changes the temperature of the system.
		The heat capacity of a substance is the amount of heat required to raise the temperature of a defined amount of pure substances by one degree (Celsius or Kelvin).
		Heat that raises the temperature of the system can be sensed, but heat that results in a change in the state of the system from solid to liquid or from liquid to gas is latent.
	chemed.chem.purdue.edu /genchem/topicreview/bp/ch5/heat.html (592 words)

	USATODAY.com (Site not responding. Last check: 2007-11-06)
		This heat is latent heat, and the evaporated water is carrying it away from your body - it's cooling you off.
		The amount of latent heat involved in a process depends to some extent on the temperature at which the process is occurring.
		Latent heat of sublimation (Ls): Refers to the heat lost or gained by the air when ice changes to vapor or vice versa.
	www.usatoday.com /weather/wlatent1.htm (798 words)

	vaporization -> The Boiling Point and Latent Heat of Vaporization on Encyclopedia.com 2002 (Site not responding. Last check: 2007-11-06)
		When heat is added to a liquid at its boiling point, with the pressure kept constant, the molecules of the liquid acquire enough energy to overcome the intermolecular forces that bind them together in the liquid state, and they escape as individual molecules of vapor until the vaporization is complete.
		This amount of heat is known as the latent heat of vaporization of the substance.
		For example, the amount of heat necessary to change one gram of water to steam at its boiling point at one atmosphere of pressure, i.e., the heat of vaporization of water, is approximately 540 calories.
	www.encyclopedia.com /html/section/vaporiza_TheBoilingPointandLatentHeatofVaporization.asp (365 words)

	UNDERSTANDING LATENT HEAT
		Latent heat is nothing magical but can be very confusing to understand.
		The energy taken to loosen the hydrogen bonds causes the surrounding air to cool (energy is taken away from the environment: this is latent heat absorption).
		When a thunderstorm develops, the release of latent heat by condensation is 7.5 times as much as the release of latent heat by freezing.
	www.theweatherprediction.com /habyhints/19 (980 words)

	Steam, vapor, density, latent, sensible heat vaporization, specific, volume, pressure, dynamic viscosity, enthalpy
		Sensible Heat, it is the quantity of heat contained in 1 kg of water according to the selected temperature.
		Heat necessary to transform 1 kg of ebullient water into vapour without change of temperature (thermal energy necessary during the change of state liquid to the state vapour).
		Quantity of heat necessary to increase the temperature of one Celsius degree on a unit of mass of 1 kg of steam.
	www.thermexcel.com /english/tables/vap_eau.htm (249 words)

	Phase Changes
		This weakening of the intermolecular forces manifests itself in the reduction of the surface tension of water as it is heated.
		If the heat of vaporization of water at 100°C is 539 calories, then subtracting the 41 calorie work component suggests that the actual binding energy of the water molecules at 100°C is 539-41=498 calories.
		An interesting feature of the process of cooling the human body by evaporation is that the heat extracted by the evaporation of a gram of perspiration from the human skin at body temperature (37°C) is quoted in physiology books as 580 calories/gm rather than the nominal 540 calories/gm at the normal boiling point.
	hyperphysics.phy-astr.gsu.edu /hbase/thermo/phase.html (747 words)

	Dorlands Medical Dictionary
		heat of fusion, the enthalpy change at constant temperature and pressure in converting a unit amount of a substance from the solid to the liquid state, usually specified in cal/g or cal/mol.
		specific heat, the ratio of the heat capacity of a substance to the heat capacity of water at constant volume or pressure; it is equivalent to the amount of heat required to raise the temperature of one gram of the substance by one degree Celsius, since the corresponding value for water is defined as 1.0.
		heat of vaporization, the enthalpy change at constant temperature and pressure in converting a unit amount of a substance from the liquid to the gas state, usually specified in cal/g or cal/mol.
	www.mercksource.com /pp/us/cns/cns_hl_dorlands.jspzQzpgzEzzSzppdocszSzuszSzcommonzSzdorlandszSzdorlandzSzdmd_h_04zPzhtm (2581 words)

	Latent Heat
		Heat absorbed or released as the result of a phase change is called latent heat.
		As it melts in your mouth, it absorbs latent heat.
		Latent heats of fusion and vaporization are measured at the normal melting and boiling points respectively, except where indicated.
	www.hypertextbook.com /physics/thermal/heat-latent (513 words)

	Glossary of Terms: L (Site not responding. Last check: 2007-11-06)
		Latent heat flux is the global movement of latent heat energy through circulations of air and water.
		Atmospheric circulation moves latent heat energy vertically and horizontally to cooler locations where it is condensed as rain or is deposited as snow releasing the heat energy stored within it.
		For one gram of water, the amount of heat energy released is 540 calories at a temperature of 100° Celsius.
	www.geog.ouc.bc.ca /physgeog/physgeoglos/l.html (1706 words)

	Latent Heat of Fusion (Site not responding. Last check: 2007-11-06)
		The purpose of the experiment is to determine the latent heat of fusion of ice.
		Using the data collected and the equation above, the latent heat of fusion of ice may be found.
		The student should calculate the latent heat of fusion of ice and compare it with the acutal by calculating the percentage error.
	physics.uwstout.edu /univphys1/labs/latent.htm (408 words)

	AMS Glossary
		The latent heat of vaporization is the water vapor specific enthalpy minus the liquid water specific enthalpy.
		When the temperature of a system of dry air and water vapor is lowered to the dewpoint and water vapor condenses, the enthalpy released by the vapor heats the air–vapor– liquid system, reducing or eliminating the rate of temperature reduction.
		The latent heat of fusion is the specific enthalpy of water minus that of ice and the latent heat of sublimation is the specific enthalpy of water vapor minus that of ice.
	amsglossary.allenpress.com /glossary/search?id=latent-heat1 (193 words)

	UNPh24.html
		Latent heat of fusion: The amount of heat per unit mass that has to be removed to freeze a substance is a constant for any given substance, and is called the latent heat of fusion.
		Latent heat of vaporization: The heat required to evaporate one kilogram of the substance is known as the latent heat of vaporization e.g.
		Use the total amount of heat absorbed in 10 minutes by liquid divides the loss mass of the liquid, that is the amount of heat needed for liquid every unit mass to becomes steam, called the latent heat of the steam of the liquid.
	www.uq.edu.au /_School_Science_Lessons/UNPh24.html (6258 words)

	Latent Heat (Site not responding. Last check: 2007-11-06)
		This release of latent heat actually warms the parcel a bit, which slows the rate of cooling of the moist air parcel.
		Latent heat release is an effect that warms air parcels and keeps them positively buoyant longer.
		This release of latent heat energy slows the cooling rate and allows moist air parcels to rise higher, than dry air parcels.
	www.personal.psu.edu /users/m/a/mas582/482/latent.htm (872 words)

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